Street-pavement



(NOAMOdel.)

`D. W. CAMPBELL.

STREET PAVEMENT.

No-I 429,303. Patented June 3, 1890.

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UNITED STATES PATENT OFFICE.

DANIEL CAMPBELL, OF VEST TROY, NEW YORK. l

STREET- PAVEMENT.

SPECIFICATION forming part of Lettere Patent No. 429,303, dated June s, 1890.

Application tiled March 18, 1889.

To all whom it may concern.-

Beit known that l, DANIEL W. CAMPBELL, a resident of West Troy, in the county of Albany and State 0f New York, have inventedl certain new and useful Improvements in Street- Pavements; and I do hereby declare that the following is a full, clear, and exact description of the invention, that will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Similar letters refer to similar parts in the several figures therein.

My invention relates to improvements in street-pavements; and it consists ofthe novel construction andcombination of parts hereinafter described, and pointed out in the claim.

Figure l of the drawings isavertical transverse section of my improved pavement laid upon a street-surface, having the' middle part broken away. Fig. 2 is a vertical longitudinal section of the pavement on an enlarged scale. Figs. 3 and 4 are respectively perspective views of a block-supporting strip and paving-block on a still larger scale.

The blocks A are made alike and provided on two opposite sides with offsets, forming the oppositely-facing abutments or ledges B B.

The strips C are made of a thickness equal to the depth of the offsets in the blocks and of a width equal to the distance between the ledges on the contiguous sidesof two blocks when placed in position for use. The blocks are preferably made of brick or stone and the strips of wood or other flexible yielding` material.

The method of forming the pavement from such blocks and strips is as follows: A row of blocks is laid upon the surface of the street, extending transversely of the same, from the curbstoneD on one side of the street to thestone D on the opposite side, with all the ledges B located on one side of the row-for example, on the front side, as shown in Fig. l, and on the right, as shown in Fig. 2-and all the ledges B on the opposite side. A strip C is then laid with its lower edge resting upon the ledges B', as shown in Figs. 1 and 2. Another row Serial No. 303,688. (No model.)

of lblocks is then laid parallel to the first and with theledges B resting uponthe upper edge of the strip, as shown in Fig. 2, and so on, a strip and a row of blocks, until a pavement is formed of the desired length.

Such a form of construction presents a yielding flexible pavement that will not easily get out of order, and will not communicate so sharp vibrations either to the atmosphere or to the ground as brick or stone pavements made of blocks supported by the ground without any intervening yielding material.

By extending the interposed strips transversely across the street there is little or no` danger of forming longitudinal ruts or depressions in the street by the more frequent use of certain longitudinal rows of blocks, such as would depress them if unsu stained by the strips below the level of the other rows.

Iam aware that street-pavements have been made from blocks severally grooved on their opposite sides and laid in rows, the contiguousrows being united by dovetailed strips inserted in such grooves, one half of each strip in the groove of one row and the other half.of the strip in the groove of a contiguous row, whereby a shear movement of the rows of blocks relatively to each other would split the strips and shear off one halt' from the other half, leaving the rows of blocks wholly unconnected with each other.

My improved pavement differs from such form of construction in that the abutting projections on the contiguous sides of the several rows of blockslap each other and wholly inclose the upper and lower edges of the interposed strips, the vertical sides of the strips being inclosed and supported by the vertical sides of the blocks, whereby a shear movement of the rows of blocks would be limited to the compressibility of the strips, and could not in any case be sufficient to destroy the function of the strips, thereby affording a durable and comparatively noiseless pavement.

What l claim as new, and desire to secure by Letters Patent, is

In a street-pavement, a plurality of rows of blocks, oifsetting abutments on the opposite vertical sides of the individual rows, those on one side of a row being near the upper ends of the blocks and those on the opposite side ICO nem the lower ends of the blocks and in the strips being wholly inelosed by the 1ower-end ro Same vertical plane with the upper-end abutubntments, substantall y as described. ments on the adjoining side of a contiguous In testimony whereof I have hereunto set rowlin combination with u plurality of strips my hand this 2d day of February, 1889. formed of some yielding substance, the indi- Y y y D 5 Vidual strips being inolosed by two contigu- DANIEL Xx y' CAMPLELL' ous rows of blocks, the upper edges of the lliinesses: strips being wholly inelosed by the upper- GEO. A. MOSHER, end abutments and the lower edges of the CHAS. L. ALBEN. 

